STIS MAMA Recovery from Anomalous Shutdown

Details STIS MAMA Recovery from Anomalous Shutdown STIS MAMA Recovery from Anomalous Shutdown

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12429w&link_type=abstract

HST Proposal ID #12429. Cycle 18

Computer Science

Scientific paper

This proposal is designed to permit a safe and orderly recovery of the FUV- or NUV-MAMA detector after an anomalous shutdown. This is accomplished by using slower-than-normal MCP high-voltage ramp-ups and diagnostics. Anomalous shutdowns can occur because of bright object violations, which trigger the Global Hardware Monitor or the Global Software Monitor. Anomalous shutdowns can also occur because of MAMA hardware anomalies or failures. The cause of the shutdown should be thoroughly investigated and understood prior to recovery. Twenty-four hour wait intervals are required after each test for MCP gas desorption and data analysis. Event flags are used to prevent inadvertent MAMA usage.The recovery procedure consists of three separate tests {i.e. visits} to check the MAMAÕs health after an anomalous shutdown:signal processing electronics check, slow, intermediate voltage high-voltage ramp-up, ramp-up to full operating voltage. This is followed by and fold analysis test {See STIS ISR 98-02R}. Each must be successfully completed before proceeding onto the next. This proposal executes the same steps as Cycle 17 proposal 11864.;

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